Researcher 2010 (2)2 EFFECT OF ORGANIC, ORGANOMINERAL AND NPK FERTILIZER ON NUTRITIONAL QUALITY OF AMARANTHUS IN LAGOS, NIGERIA
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1 EFFECT OF ORGANIC, ORGANOMINERAL AND NPK FERTILIZER ON NUTRITIONAL QUALITY OF AMARANTHUS IN LAGOS, NIGERIA 1 Makinde, E.A. 2* Ayeni, L. S and., 3 Ojeniyi, S.O 1 4 Odedina J.N. 1 Department of Botany, Lagos State University, Ojo, Lagos, Nigeria. 2 University of Agriculture, Department of Soil Science and Land Management, Abeokuta, Ogun State, Nigeria 2 Department of Crop Soil and Pest Management, Federal University of Technology, PMB 704, Akure, Nigeria. 4 University of Agriculture, College of Plant Science, Abeokuta, Ogun State, Nigeria 2* Author for correspondence. leye_sam@yahoo.com ABSTRACT In Nigeria, organic fertilizers are being developed from organic and farm wastes and these can be fortified with inorganic. Therefore eight fertilizer treatments namely: (1) control (no fertilizer), (2) Pacesetter Grade B organic fertilizer (PGB) at 3t/ha 100%, (3) 300 kg/ha NPK fertilizer, (4) PGB + NPK fertilizer (75:25), (5) PGB + NPK (50:50), (6) Kola pod husk (KPH) at 3t/ha 100%, (7) KPH + NPK (75:25), and (8) KPH + NPK (50:50), were applied to amaranthus (Amaranthus cruentus). Residual effect on second and third crops was also studied. Proximate analysis was done to determine crude protein (CP), crude fibre (CF), ash and ether extract (EE). The PGB and KPH alone or combined with reduced level of NPK generally increased CP, ash and EE significantly on immediate and residual basis. The organic fertilizers had more residual effect than NPK. Organic materials alone or combined with NPK reduced CF especially on residual basis. Compared with organic materials, NPK gave least values of CP, ash, CF and EE. Application of KPH + NPK (50:50), KPH and PGB gave highest values of CP and ash respectively. Integrated application of organic fertilizers and NPK gave highest values of EE in order PGB + NPK (50:50), KPH + NPK (50:50), and PGB + NPK (75:25). Organic fertilizers and OMF maintain adequate CP and EE in first and second crops whereas NPK did not maintain adequate CP in second crop. [Researcher. 2010;2(2):91-96]. (ISSN: ). Key Words. Ash, crude protein, fibre, residual effect, integration INTRODUCTION Most vegetable farmers in tropical countries such as India, Malaysia, Indonesia, Philippines, South Pacific and tropical Africa are small holders who cannot afford cost of inorganic fertilizers, although soil fertility limits yield of vegetables especially in urban and periurban centres. Hence farmers depend largely on locally sourced organic fertilizers. In Nigeria organic fertilizers are being developed from farm and city wastes, also organomineral fertilizers (OMF) in which organic wastes are fortified with inorganic N or NP fertilizers. Since different organic wastes influence nutritional quality of crops differently, evaluating performance of different brands and composition of organic and organomineral fertilizer in relation to conventional mineral fertilizer is imperative. Organic and organomineral fertilizers were found to increase significantly yield of maize and vegetables such as pepper, tomato, okra, melon and amaranthus (Ipinmoroti, 2003, Fagbola and Dare, 2003, Olowokere 2004, Adeoye et al, 2008, Ojeniyi and Adejobi, 2002, Ojeniyi et al, 2009, Akanni and Ojeniyi 2008, Makinde However there is scarce research information on effect of organic and organomineral fertilizers on nutritional quality of amaranthus. Adekayode (2004) found that wood ash, goat and poultry manures increased fat, protein and reduced carbohydrate in amaranthus. The objective of this work is to study effect of kola pod husk (KPH), a farm waste, and pacesetter grade B organic fertilizer (PGB) used alone or in combination with NPK fertilizer on crude protein, crude fibre, ether extract and ash in amaranthus. 91
2 MATERIALS AND METHODS Experiment was conducted at Ikorodu farm settlement ( N, E) and Lagos State University () Ojo ( N, E) in rainforest and swamp forest areas respectively. The soils at Ikorodu and were classified as Orthic luvisol and dystric fluvisol respectively. The soils are sandy, high leached and deficient in N,P,K, Ca and Mg. (Makinde, 2007), expecially at. Organic manures used were kola pod husk (KPH) and pacesetter Grade B(PGB) composed from nonfortified sorted city refuse, poultry waste, cowdung, sawdust and water hyacinth. The KPH was obtained form kola processing unit of Cocoa Research Institute of Nigeria and PGB obtained from pacesetter organic mineral fertilizer plant Bodija Ibadan. The KPH was oven dried at 70 0 C to constant weight and made to pass through 2mm sieve. The test crop was Amaranthus cruentus variety (ED82/1019) early maturing type. The optimum N requirement (67.5 kg N/ha) for amaranthus was used to amend organic manures at ratios3:1 and 1:1 organic: NPK fertilizer respectively. Eight treatments used were (i) control (no fertilizer), (ii) KPH at 3t/ha(100%), (iii)kph + NPK (75:25), (iv) KPH + NPK (50:50), (v) PGB at 3t/ha (100%), (vi) PGB + NPK (75:25),(vii) PGB + NPK (50:50), and (viii) NPK (100%). Experiment was laid out in a ramdomized complete block design with four replicates per location. Land area was 27 x16m per location. Manure and fertilizer were incorporated in seedbeds. Seedlings were raised and transplanted at 10cm x 20cm using one seedling per hole. Harvesting was done 6 weeks after transplanting. Leaf samples were oven dried at 60 0 C to constant weight. Dried samples were ground and passed through 2mm sieve. The ash, crude fibre and ether extract were determined as described by AOAC(1990). Nitrogen was obtained by microkjedahl method and percent N converted to protein by multiplying with The experiment was repeated without any fertilizer application at second and third planting periods to study residual effect of treatments. Analysis of variance was performed on the data and means separated using Duncan s multiple range test. RESULT AND DISCUSSION Data on nutrient composition of PGB and KPH are in Table1. The organic materials have considerable contents of N, P, K and Ca which on decomposition of the materials would be released for crop uptake and synthesis of protein, crude fibre, ash and ether extract as appropriate. The KPH clearly had more N, P, K and Ca than PGB. Data of proximate analysis of first, second and third crops of amaranthus are shown in Tastes 2, 3 and 4 respectively. : PGB and KPH alone or combined at reduced levels with NPK increased crude protein significantly on immediate basis, and on residual basis in case of second and third amaranthus at Ikorodu and locations. NPK fertilizer also increased CP on immediate basis at Ikorodu, and on residual basis in case of second crop at both locations. However NPK had no residual effect or had insignificant effect in case of third crop, as opposed to PGB and KPH alone or fortified with NPK. Therefore organic fertilizers had more residual effect on CP than NPK. : Organic and NPK fertilizers tended to reduce CF in amaranthus at Ikorodu and. However at KPH alone or combined with NPK at 75:25 reduced CF relative to control. At Ikorodu, KPH combined with NPK at 50:50, PGB combined with NPK at 75:25 and NPK reduced CF. In case of second crop, applications of organic fertilizers alone or combined with NPK reduced CF. Exceptions were found in NPK or KPH combined with NPK at 50:50, and NPK at. With regard to third crop, organic materials used alone or combined with NPK generally reduced CF. Therefore the materials had residual effect up to the third crop. 92
3 (EE) At Ikorodu, PGB or KPH alone and in combination in chlorophyll formation, photosynthesis and leaf with NPK increased EE in amaranthus relative to formation, N influences starch formation and crude control, similar observation applies at except fibre. Alabi and Odubena (2008) indicated that leaf chlorophyll of organic fertilizer treated crops was in case of PGB, KPH, NPK + KPH (50:50). However higher than NPK treatment crops. This explains least in the second crop, PGB or KPH alone or combined values for NPK treated amaranthus in the present with NPK increased EE relative to control ( except study. NPK at Ikorodu). In the third crop, organic materials alone or combined with NPK, and NPK alone increased EE significantly. Ash Generally the organic materials alone or combined with NPK increased ash significantly in first and second amaranthus. Similar observation was made at in case of third crop. Therefore there was residual effect of fertilizers. Mean data covering the two locations and three test crops are shown in table 5. It is shown that relative to control, PGB, KPH alone or combined with reduced levels of NPK and NPK alone increased ash, CP and EE in amaranthus, while CF was reduced. Thus the organic materials alone or integrated with NPK increased nutritive quality of amaranthus. The NPK gave least values of CP, CF, ash and EE compared with organic materials alone or combined with NPK. This could be due to the ease with which nutrients such as N, P and K in NPK fertilizer was lost by leaching. Nutrients in organic materials are less easily available since the materials have to be decomposed and organic nutrients mineralized. Nutrients released from NPK and organic sources such and N, P and K are formation blocks for protein (N), nucleoprotein (P), ash (K) and ether extract (P in form phospholipids) (Brady 1974). Through its effect Comparison of PGB and KPH indicated that the latter produced higher nutritive quality of amaranthus (Table 5). It gave higher mean values of CP, ash and EE. KPH also gave higher values of CP and ash in four out of six instances. Greater influence of KPH on crop quality could be due to higher concentrations of nutrients (N, P, K, C a) recorded for it (table 1). On sustainable basis, organic and organomineral treatments did not maintain good quality of amaranthus in relation to Cp as reflected in the third crop. Treatment KPH + NPK (75:25), and KPH + NPK (50:50) maintained high quality of amaranthus in the first and second crops because the CP content was above the critical 13-17% (Oyenuga and Fetuga, 1975; Rubatizky and Yamaguchi; 1997). Also PGB + NPK (50:50) gave CP above the cirtical in the second crop, and also KPH. NPK did not maintain adequate CP in second and third crops. Therefore the organic materials used alone or combined with NPK at reduced levels sustained good nutritive quality of amaranthus as opposed to NPK fertilizer. All treatments maintained high free extract, the values being higher than critical 0.3% (Oyenuga and Fetuga, 1975). However it is the protein that is most limiting in human nutrition in the tropics. Organic and organ mineral fertilizer should be applied to amaranthus after the second crop to maintain adequate protein content. Table 1. Analysis of pacesetter organic fertilizer (PGB) and kola pod husk (KPH). Element PGB KPH N% P% 0.28% 6.0 K% 1.15% 4.97 Ca% 1.19% 1.61 Nag% Nd 0.28 Source for PGB: Pacesetter Fertilizer Company Ibadan, Nigeria. Source for KPH: Cocoa Research Institute of Nigeria, Ibadan. Nd = not determined. 93
4 Table 2 Effects of fertilizers on proximate analysis of amaranthus at Ikorodu and IKORODU Treatment control 10.63f 13.90e 2.59g 11.95h 12.75g 10.30b 5.09e 15.15e PGB (100%) 13.13C 14.30c 2.27h 15.91f 15.75f 10.87a 5.15d 18.88d PGB+ NPK (75:25) 12.56d 12.15g 5.52b 15.79e 15.88d 10.93a 2.82h 19.14c PGB+ NPK (50:50) 14.13d 15.32g 5.08d 14.41f 15.81e 10.93a 3.04g 18.94d KPH (100% 12.13b 15.71a 3.09f 17.53a 17.56b 8.42d 5.42b 22.54b KPH+NPK (75: c 14.09d 4.53e 16.62b 17.69a 9.83c 3.82f 23.18a KPH + NPK (50:50) 13.56b 12.99f 5.69a 16.06c 17.38c 10.83a 9.51a 19.21c NPK (100%) 18.81a 11.58h 5.10c 11.9g 12.63g 10.49b 5.21c 14.62f PGB = Pacesetter Grace B: KPH = Kola Pod Husk. NPK = NPK 15:15:15 Fertilizer Means having the same letters(s) in the same column are not significantly different at 5% Duncan Multiple Range Test (DMRT) Table 3: Residual effects of fertilizers on Proximate analysis of second crop of amaranthus at Ikorodu and IKORODU Treatment Control 7.00h 12.70b 2.48g 14.09f 1.25h 13.15c 1.89h 14.91f PGB (100%) 9.38f 12.63c 2.88e 13.95g 14.68b 10.83h 7.65b 17.37c PGB+ NPK (75:25) 10.00e 9.48h 6.63b 14.89e 14.88a 10.96g 8.23c 15.85e PGB+ NPK (50:50) 13.13d 10.56g 8.48a 15.96b 14.44c 11.57e 7.08c 11.52h KPH (100% 13.35c 12.52d 3.46f 16.71a 6.25d 11.25f 3.29f 19.65b KPH+NPK (75: b 12.15e 5.34c 15.05c 3.31e 12.92d 3.37e 16.74a KPH + NPK (50:50) 19.75a 13.38a 5.26c 14.91d 2.88f 13.79d 3.95d 16.40d NPK (100%) 7.25g 11.17f 2.16d 12.63h 2.19g 14.94a 2.10g 13.84g PGB = Pacesetter Grace B: KPH = Kola Pod Husk. NPK = NPK 15:15:15 Fertilizer Means having the same letters(s) in the same column are not significantly different at 5%. 94
5 Table 4: Residual effects of fertilizers on Proximate analysis of third crop of amaranthus at Ikorodu and IKORODU Treatment Control 2.81g 10.71b 2.24f 28.53c 1.44f 15.50a 2.12h 11.18h PGB (100%) 5.38e 7.70h 3.14f 31.80b 1.88d 12.16d 7.83e 20.50d PGB+ NPK (75:25) 4.88f 8.58e 5.55c 22.77f 1.88d 11.60e 7.77f 17.64f PGB+ NPK (50:50) 5.50d 11.80a 5.46d 23.38e 1.94c 12.46c 9.85b 20.09f KPH (100% 10.25a 9.98d 5.69a 20.38g 2.06b 7.23h 9.93a 22.38b KPH+NPK (75: c 8.50f 4.54e 17.57h 1.88d 12.63b 7.86c 17.02g KPH + NPK (50:50) 9.88b 8.45g 5.61b 32.12a 2.50a 9.49f 7.83d 20.52c NPK (100%) 1.4h 10.05c 2.55g 23.78d 1.49e 7.46g 11.14d 23.41a PGB = Pacesetter Grace B: KPH = Kola Pod Husk. NPK = NPK 15:15:15 Fertilizer Means having the same letters(s) in the same column are not significantly different at 5%. Table 5. Mean data of proximate analysis for three crops and two locations (%). Treatment protein fibre Ash extract Control PGB PGB + NPK (75:25) PGB + NPK (50:50) KPH KPH + NPK (75:25) KPH + NPK (50:50) NPK CONCLUSION Kola pod husk and pacesetter organic fertilizer at 3t/ha alone or combined with NPK fertilizer at reduced levels are suitable for improving nutritional quality of amaranthus. The organic materials had. residual effect on protein, either extract and ash content in first and second crops. They are recommended for use in cultivation of amaranthus 95
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